Works



(No Model.)

J. W. SEE.

LATHE.

No. 364,307. Patented June 7, 1887.

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UNITED STATES PATENT OFFICE.

JAMES w. SEE,

LATl-l E.

OF HAMILTON, OHIO, ASSIGNOR TO THE NILES TOOL FORKS, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 364,307, dated June 7, 1887.

Application filed March 5, 1887:

T0 to whom it may concern:

Be it known that I, JAMES W. SEE, of Harm ilton, Butler county, Ohio, have invented certain new and useful Improvements in Lathes, of which the following is a specification.

This invention relates to metal working and other large lathes, and has reference particularly to improvements in the tail-stock, as will be readily understood from the following description, taken in connection with the accompanying drawings, in whicl1 Figure 1 is aside elevation of atail-stock embodying-my improvements, a portion of the lathe-bed being also shown; Fig. 2, a similar view with portions appearing in vertical longitudinal section; Fig. 3, a front elevation of the tail-stock, showing a portion of the tailstock and lathe-bed in vertical transverse section; and Fig. 4, a vertical transverse section, upon a somewhat enlarged. scale, of a portion of the tail-stock and lathe-bed in the plane of the axis of one of the eccentric shafts.

In the drawings, A indicates a portion of an ordinary lathe-bed; B, an ordinary tail-stock; O, the sides of the tail-stock; D, the usual clamp by which the tail-stock is secured to the bed after adjustment; E, the usual clampbolts for tightening the clamp; F, a pair of eccentric shafts disposed parallel to each other and transverse to the tailstock, these shafts being journaled in bearings in the sides of the tail-stock, and provided at their ends with other journals eccentric to those bearings; G, levers projecting transversely from intermediate portions of the eccentric shafts; H, a link connecting these levers and serving to cause both eccentric shafts to oscillate simultaneously; J a notch at each of the bearings in the sides of the tail-stock, said notches being at the lower side of the bearings and on the inner side of the sides of the tail-stock,

and leading upward to said bearings; K, roll ers freely journaled on the eccentric ends of the eccentric shafts, the diameter of these rollers being such that their peripheries can be brought into engagement with the top of the lathe-bed when the eccentric shafts are properly oscillated, or partly rotated, rather; and L, a squared extension of one of the eccentric 5o ends of one of the eccentric shafts, such.

Serial No. 229,800. (No model.)

squared extension being adapted to receive a wrench, and preferablyfitted to the tool-wrench usually employed with the lathe.

When the eccentric shafts are partially rotated in one direction, the eccentric portions on which the rollers run will be so high that the peripheries of the rolls will be free of engagement with the lathe-bed. In this condition the tail-stock may be clamped to the bed, as usual, and when the clamp is loosened the tail-stock may be shifted, as usual, the shifting being effected by sliding the tail-stock along the lathe-bed. If a wrench be applied to the squared extension and the eccentric shafts partially rotated, the eccentric journals on which the rollers revolve will also be revolved, and the consequence will be that the periphcry of the rollers will come into contact with the top of the lathe-bed and that the tail-stock will be lifted a trifle. It is to be understood, of course, that before such operation the clamp has been loosened in order to permit the-tailstock to be shifted. The lifting action referred to will of course tend to tighten the clamp; but the lifting action referred to should not be carried to such an extent as to cause the clamp to engage the lathe-bed. If, now, while the tail-stock is thus free to move along the lathebed, and while it is thus supported in the lifted position by the rollers, and while the wrench is still on the squared extension, the wrench be pulled upon in the direction of the length of the lathe-bed, the tail-stock will roll along the lathe-bed freely. By removing the wrench the tail-stock will settle down upon the bed again, and may be clamped as usual.

By means of the improvements a workman may shift a heavy tail-stock with case, while in the absence of the improvement two or more men might be required to shift the tailstock; has no effect in offering increased resistance to the clamping-bolts when the clamp is to be tightened.

In the illustration the rollers are journaled on eccentric portions of the shaft projecting outside the sides of the tailstock, and the main portions of the shafts are as wide as the tail-stock and are journaled in its sides, and

The presence of the roller mechanism ICC with the eccentric shafts. It will be readily seen that under ordinary circumstances the eccentric shafts could not be inserted in their places, as the levers prevent the shafts being passed through the bearings from the outside of the tail-stock. It is to be understood, of course, that the rollers are removed from their journals, and that they can be placed in position after the shafts have been placed. The

'notehcs J permit the insertion of the eccen-c I claim as my invention- The combination of a tail-stock provided with hearings in its sides, a'pair of eccentric shafts journaled in suehbearings and provided with levers and adapted for partial rotation in said bearings, a link uniting said levers and serving to cause the two shafts to rotate simultaneousl y, rollers journaled on portions of said shaft eccentric to their hearings in the tailstock, and to have their peripheries engage the top of the lathe-bed when said shafts are partially rotated, and a provisi0n-such as a squared extension to receive a wreneh-upon one of said eccentric shafts, to serve in partially rotating said shafts, substantially as and for the'purpose set forth.

JAMES NV. SEE. \Vitnesses:

G. N. CLAPP, W. A. SEWARD. 

